from rest_framework import serializersfrom .models import Areaclass AreaSerializer(serializers.ModelSerializer):    """省/市/区一个个的序列化器"""    class Meta:        model = Area        fields = ['id','name']class SubsAreaSerializer(serializers.ModelSerializer):    """省和市的单一序列化器"""    subs = AreaSerializer(many=True, read_only=True)    class Meta:        model = Area        fields = ['id','name', 'subs']# # 河北省        市# hb.subs